Cutting tool



I F. SANTRO Aug. 30, 1949,

CUTTING TOOL Filed Dec. 26, 1946 INVENTOR.

FQA NK J'A NT'RO A T TOENE K tool.

Patented Aug. 30 1949 aasosdrf f" eu'rTING moon. Frank santmgssii nr ir eiseog califr Application ne'eeinuenze, 1c4asena1m; 7.125542% i LClain (01. 95912-5) Ilhis invention relates to cutt ngtools;- and x I citation;

The present. invention. embraces. a cutting tool; as; distinguished f rom a. grinding tool. to; perform the: operation of: reconditioning: a; valve seat; or; alternatively; cutting ai'larger or. deeper seat, it such, is desired, The cutting; tool; herein-ode.- scrjlaiireimleleflithi user thereof to cut or recondition a valve seat far more rapidly, efiiciently and accurately than washeretofore possible with known tools.

Again; iti's an object of the es nrginvenuq V to provide a cutting tool for cutting valve seats; and wherein -the tool may be clamped rigidly in position in order that it is al-igned properly vvith theworle to be cut and. yet -which provid s= for easy adjustment orthetool'relative to the work.

Another objectis to provide a valve seat cutter, which is easily adjustablewith respect to the depth; of cut and diameter-o f cut desirech A fiurther; object of thisinventiom is to provide a v lv at, tt n o w ich: eenativ v inexpensive to manufacture, easy to utilize, and rapid in operation and which is provided with an adjustable cutting head, wherein a plurality of different cutting bits may be easily affixed. Further objects and advantages will become apparent upon reference to the drawings and specification in which corresponding indicia represent corresponding parts in the several views.

In the drawings:

Fig. 1 is a perspective view of the cutting tool.

Fig. 2 is a cross sectional view of the cutting tool affixed to an engine block or head and indicating a valve seat, wherein the vertical axis thereof is disposed at an oblique angle to the top of the engine block or head to which the said tool is clamped.

Fig. 3 is a side elevational view of the cutting tool afiixed to an engine block or head and wherein the vertical axis of the valve seat is disposed normal to the top of the engine block or head.

Fig. 4 is a bottom, plan view of the cutting I have illustrated the instant invention as ap- .55

\ rinsed alt-ant oblique ans 2'; pliedz'te a conventi nal en ine-me k-or-head A, having avalveznertlBiV-alvestemauerturefir a d; valve-sewn, andswherein-tne-ve ticataxiseq he: velvet-seat and,valvasteml;aperture is disa the 3 top, Qt the; engine; slasher head-Ate:whichit ewteollisl-clamped In Fig. 3 the vertical axisioi the valver sfi lli i1entrained;- as; a: valve: seat, insert:13!, and valve stemirborerca isd-ispesedlnormalz to thel tcn-of. the

cutti :t e e mer esa eri aybea r qetedeenerallvrat 2;-.-,havine;a tooli-engaging,head i en av ndic tedat; Thfirh i lali s: P Q? vided w ths an"; annular shoulder 4; which-y restsagainst a collar; aimed to: exterioriy threaded sleeve- 5 which. carries. an. int rnally tmea eda di st eaeel z lhe e veandi attached eollar; are; otatahle; relativeto Saidr beringgbar. Th th acl l sleevefi i threadablylt 'e h ee .mt r erlvc re ee iw rm d 1g ma n-b ariee h s T e s rs journaled in the bottemlefithebearine ho s at k t. M i Mi id. e I J is,a11tag eda cutter head plate 1.31." llt'is iee e iptedthatthex boringbar is-znieidl .i to theseutter. head. lz sat atth ,sa

rotatew' hthebo iingban. 'llh cutter: headnlets, le s-.1 r m vab e; ae e r e-ithe utt 'headf. he me ns tr i l etsuits.- es-su es screws lie. cutting leit', t5, s provided in h Gutter; head in a; slidewaw provided; there n. tor mat ia n d' a i t Pm sw mhemes? s a e it e esupermsedl ve he ,5. sev n en elt til a e; fi s th bit 45 in place. If it is desired to utilize various sizes or shapes of bits IS, the cutter plate i3 and screw It may be loosened and a different bit inserted.

The split collar 1, which is threadably engaged to sleeve 6 and which may be moved vertically with respect thereto, is provided with a locking screw i? in order that the said collar may be fastened to the sleeve in any desired position to prevent relative movement between said sleeve and said collar. The sleeve 1 functions as a means for adjusting the depth of vertical cut performed by the cutting tool. For example, if it is desired to cut a 4 inch seat, the cutter bit is placed in position with respect to the work prior to cutting and in contact therewith and the sleeve '1 is moved to within inch of the flat shoulder 18 of main bearing housing 8 and locked there in position by means of screw 11. The boring bar is rotated and the desired depth of cut will be accomplished when collar 7 contacts shoulder I8. It is to be noted that the bore 2| is provided in the center of the cutter head for the reception of a centering stud 22 in order to align the tool with the valve seat by centering the stud 22 in valve stem aperture C, as illustrated in Fig. 2.

The means for clamping the present cutting tool to an engine comprises an anchor block 25 provided with a vertical slot 26, through which a suitable bolt 27 may be inserted in order to attach the same to an engine block, as indicated in Figs. 2 and 3. The longitudinal, vertical slot 26 allows for relative longitudinal movement of the tool relative to the position of the clamping bolt 21. The anchor block 25 includes a forwardly projecting, horizontally disposed stud portion 28 which is pivotally connected, by means of a bolt 29, to a link 3| in order to allow for relative tilting movement between link 3i and anchor block 25. The link 3| is connected to the main bearing housing 8, by means of a bolt 32, in order to allow for pivotal movement therebetween. Consequently, the cutting tool may be disposed at varying angles with respect to the point of anchored connection to an engine block and greatly facilitates positioning of the cutting head relative to work.

The present invention enables the user thereof to accomplish cutting and/or reconditioning of valve seats in hard metal engine blocks or cutting and/or reconditioning of valve seat insert portions at greatly increased tempo of production and insures increased accuracy because of the mounting mechanism provided therefor which allows flexibility of movement thereof.

It is to be noted that bolts 21, 29 and 32 are tightened when the work is in exact position to prevent unwanted movement of the tool relative to the work. correspondingly, if it is desired to move the tool relative to the work, one or a plurality of said bolts may be loosened in order to enable movement of the tool.

The cutting bit [5 may be adjusted as to depth of lateral cut by means of adjusting screw [6 and/or adjusting screws M, or, difierent tools of various sizes and shapes may be substituted selectively to be driven by the boring bar without necessity of substitution of the entire cutting tool assembly and complete repositioning of the clamping mechanism with respect to the work. Heretofore known valve seat conditioning tools were not adjustable with respect to the grinding means provided therefor. Fig. 3 illustrates a cutting bit l5' utilized for cutting valve seat in sert D.

While I have described my invention in more or less specific detail for purposes of clarity of illustration, example and description, it is to be understood that various changes, modifications and alterations may be practiced within the spirit of the invention and the scope of the appended claim.

I claim:

A cutting tool for valve seats comprising a work-clamping mechanism consisting of a work anchor block provided with an open-ended bolt receiving slot arranged for adjustable slidable attachment to a vertically disposed stud bolt projecting from the work, a link attached pivotally to said block and to a main bearing housing to permit said main bearing housing to be rocked about said pivotal attachment toward and away from said anchor block, said link attached pivotally to said main bearing housing to permit said housing to be rocked in a direction at right angles relative to the direction of rocking movement of said housing toward and away from said anchor block, a boring bar mounted rotatably in said bearing housing and extending therethrough, said boring bar having a tool-engaging portion at one end and carrying a cutter head on the opposite end, a sleeve mounted rotatably on said boring bar and attached threadably to said bearing housing, a split collar carried threadably by said sleeve and adapted to be locked in position relative thereto, a slideway in said cutter head, a cutting bit mounted in said slideway of said cutter head and projected laterally from said head, and means comprising said cutter head and a cutter plate attached removably to said head to allow for adjustment, removal and replacement of a cutting bit in said cutter head.

FRANK SANTRO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,186,403 Johnsen June 6, 1916 1,787,871 Moen Jan. 6, 1931 FOREIGN PATENTS Number Country Date 158,047 Germany Jan. 31, 1905 163,848 Great Britain June 2, 1921 

